You always have been able to get the waterproof boxed kit in two flavours - with and without the saw. The saw is something like £25 on it's own, the mirror about 8, etc etc, so either the full or basic kit are cheaper than buying the bits individually.
I did my local Blacks (manchester) at the weekend and they were selling the full kit at the typical UK price of £49.xx. They had the blast match, saw, wetfire, and mirror as individual items too.
The cheaper kit without the saw was noticeably absent but the store was busy so I didn't wait around to ask about it. £15 is a very good price if anyone does find it for that.